Release v0.3.16

[placerda]

Release v0.3.16

Automated release branch created from develop.

What happened

• Branch release/v0.3.16 created from develop
• CHANGELOG.md updated: versioned section [0.3.16] added
• Plugin versions synced to 0.3.16 (package.json, plugin.json, marketplace.json)
• Staging pipeline triggered automatically (build → TestPyPI + VSIX pre-release → verify)

Next steps

1. Wait for the Staging pipeline to pass
2. Review and approve this PR
3. Merge to main
4. Tag and push: git tag v0.3.16 && git push origin v0.3.16
5. Approve the PyPI publish and VSIX stable publish in the Release workflow
6. Sync develop: git checkout develop && git merge main && git push origin develop

Checklist

• Staging pipeline passes (build + TestPyPI + VSIX pre-release + verify)
• CHANGELOG entries reviewed
• PR approved and merged to main
• Tag v0.3.16 pushed
• PyPI publish approved
• VSIX stable publish approved
• develop synced from main